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XPOSUREPHOTOS.COM

If it wasn't clear before why Jennifer Aniston was so quick to accept Justin Theroux's marriage proposal, then the picture above should take care of any questions.

Mr. Aniston's man looked as sexy as ever taking his Ducati for a spin in West Hollywood after a workout session Thursday. It's the first time we've seen Jen's fiancé since news of the engagement broke Sunday. Jen accepted Justin's marriage proposal Aug. 10 on her Wanderlust costar's 41st birthday.

The trendy hipster twosome—who have never been shy or hidden their romance—have yet to pack on the PDA since announcing their engagement.

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